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JEE Mains · Maths · STD 12 - 11. three dimension geometry

જો \((3,2,1)\) માંથી પસાર થતી અને સમતલો \(x+2 y+z=0\) તથા \(3 y-z=3\) ને સમાંતર રેખા પર \((1,9,7)\) માંથી દોરલ લંબપાદ \((\alpha, \beta, \gamma)\) હોય, તો \(\alpha+\beta+\gamma=..........\).

  1. A \(-1\)
  2. B \(3\)
  3. C \(1\)
  4. D \(5\)
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Answer & Solution

Correct Answer

(D) \(5\)

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Detailed explanation

\(\begin{array}{l}\text { Direction ratio of line }=\left|\begin{array}{ccc}\hat{ i } & \hat{ j } & \hat{ k } \\ 1 & 2 & 1 \\ 0 & 3 & -1\end{array}\right| \\ =\hat{ i }(-5)-\hat{ j }(-1)+\hat{ k }(3) \\ =-5 \hat{ i }+\hat{ j }+3 \hat{ k }\end{array}\)…
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